Syntheses, Spectra, and Structures of (Diphosphine)platinum(II) Carbonate Complexes

Article abstract of DOI:10.1021/ic9603159

A variety of (diphosphine)platinum(II) carbonate complexes, (LL)Pt(CO₃), are readily prepared from the corresponding (diphosphine)platinum dichlorides by treatment with silver carbonate in dichoromethane solution provided that water is present. This reaction also permits facile preparation of analogous ¹³C-labeled complexes. The carbonate ligands in these complexes have been characterized by IR and ¹³C NMR spectroscopy. Alternative preparative routes involve conversion of the precursor dichlorides to the corresponding dialkoxides or diphenoxides, followed by treatment with water and carbon dioxide. Various reaction intermediates have been spectroscopically observed in the latter syntheses. Two crystalline modifications of (Ph₂PCH₂CH₂CH₂PPh ₂)Pt(CO₃), one with and one without a dichloromethane of solvation, have been studied by single-crystal X-ray diffraction. Crystal data for PtP₂O₃C₂₈H₂₆: P2₁/c, Z = 4, T = 200 K, a = 10.362(8) ?, b = 14.743(6) ?, c = 19.183(10) ?, β = 122.69(6)°. Crystal data for PtP₂O₃C₂₈H₂₆·CH ₂Cl₂: P2₁/c, Z = 4, T ≈ 298 K, a = 11.744(2) ?, b = 15.526(3) ?, c = 15.866(3) ?, β = 101.58(1)°.